Hi, I ran many times this worksheet and I had no problem. Today I update to new sagemanifolds 0.9.1 and sage-7.3 from sagemath binary (I can 't get it working with ppa AIMS I got rights problems) and ran into this error : EM_F.exterior_der()[:] All with exterior_der have errors, is there a way to correct it ? Best regards Henri
---------------------------------------------------------------------------AttributeError Traceback (most recent call last)<ipython-input-10-6688356e2a82> in <module>()----> 1 EM_F.exterior_der()[:] /home/pi/sage/src/sage/structure/element.pyx in sage.structure.element.Element.__getattr__ (/home/pi/sage/src/build/cythonized/sage/structure/element.c:4152)() 317 dummy_error_message.name = name 318 raise dummy_attribute_error--> 319 return getattr_from_other_class(self, P._abstract_element_class, name) 320 321 def __dir__(self): /home/pi/sage/src/sage/structure/misc.pyx in sage.structure.misc.getattr_from_other_class (/home/pi/sage/src/build/cythonized/sage/structure/misc.c:1772)() 251 dummy_error_message.cls = type(self) 252 dummy_error_message.name = name--> 253 raise dummy_attribute_error 254 try: 255 attribute = getattr(cls, name) AttributeError: 'DiffFormFreeModule_with_category.element_class' object has no attribute 'exterior_der' -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.